@blaggle42 @solrize
https://www.w3tutorials.net/blog/firefox-add-ons-how-to-install-my-own-local-add-on-extension-permanently-in-firefox/
There er multiple ways but yes they don't make it easy cause the want to make the attack vector aka ( a "friend" sent you a email with the "hottest new" firefox extension ) as small as possible.
